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Old 23rd February 2018, 03:17 PM   #21
SVI2004A is offline SVI2004A  New Zealand
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I ran with the resistor chain current stabiliser... I wasn’t keen on the existing current stabiliser... in fact that may well be the cause of failure.... similar array wreaked havoc on V4X amps
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Old 23rd February 2018, 03:19 PM   #22
SVI2004A is offline SVI2004A  New Zealand
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Those who wonder.... same power ic in Z600 Z610 Z650 V66 X90 - never see those have current stabiliser dramas they present danger to the power ic
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Old 23rd February 2018, 03:29 PM   #23
SVI2004A is offline SVI2004A  New Zealand
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This from X90... lower resistance... more class A region... ran hotter

Z600 ran 2x 3.9K a lil more relaxed on bias... you could simply hook straight up to existing current stabiliser... Id consider that reckless....
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Old 23rd February 2018, 03:35 PM   #24
SVI2004A is offline SVI2004A  New Zealand
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Are dang...

X90 here~

Lower resistance... runs hotter

See schematic
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Old 23rd February 2018, 03:35 PM   #25
Depaj is offline Depaj  France
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Ok I see what you're doing (don't totally got it but just enough to understand the concept).

I think if I do this for my friend it will have to be on a budget so I'll probably bypass the whole pcb idea and connect the components directly between pins/wires.
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Old 23rd February 2018, 06:45 PM   #26
anatech is offline anatech  Canada
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Quote:
I'll probably bypass the whole pcb idea and connect the components directly between pins/wires.
Yipes! You'll live to regret that decision I think.

-Chris
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Old 23rd February 2018, 06:47 PM   #27
Depaj is offline Depaj  France
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If it were mine I would do it for sure, and I count on insisting he decides that too but from there it's out of my hands.
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Old 23rd February 2018, 06:48 PM   #28
anatech is offline anatech  Canada
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Speaking from experience here. I would pull out of the project. Otherwise everything that goes wrong will be your fault.

-Chris
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Old 23rd February 2018, 06:52 PM   #29
Depaj is offline Depaj  France
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I'm having cold sweats from the beginning but he really wants to see them live again. Would you recommand getting rid of the whole amplifier part, take the output of the preamp/tone control, put in a new amplifier kit using +/-48V rails and connect the output to the protection circuit. Or even get a kit with a built in protection relay and connect directly to the speakers and power meters ? It would seem that budget wise that might not even turn out to be more expensive.
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Old 23rd February 2018, 06:55 PM   #30
anatech is offline anatech  Canada
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I would do what you are most comfortable with. If he doesn't want to do something the proper way, then bail on the project. Since you will be held responsible for what you do, recommended or not, you have every right to expect that you are allowed to do things in a reliable way. Otherwise ... you just can't win.

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